A convenient nanoscale technique is reported for the fabrication of highly ordered hemispherical silver nanocap arrays templated by porous anodic alumina (PAA) membranes as robust and cost-efficient surface-enhanced Raman scattering (SERS) substrates. This geometry produces a high signal due to its periodic hexagonal arrangements control gap between nanostructures in sub-10-nm regime. The surface structure can be tuned further optimize enhancement factor according optional PAA deposition...

We propose and experimentally verify a bidirectional bending splitter of designer surface plasmons which is composed two metallic gratings trapezoid grooves. A metal wire used to excite the propagating along gratings. full-wave numerical method has been simulate performance splitter. The experimental verifications in microwave frequencies have excellent agreements simulations. It demonstrated that can not only split electromagnetic waves at different frequencies, but also guide effectively...

This paper demonstrates a prototype of selfsustained body area networks (BAN) sensor, which consists the electrically small triple-band rectenna, direct current (dc) energy management and storage module, microcontroller, sensing communication module. The proposed antenna is composed corrugated metal-insulator-metal plasmonic structures, covers triple frequency bands, including GSM-900, UTMS2100, TD-LTE bands. Its electrical size only 0.21 λ × 0.2 at 900 MHz. gains reach 1 dBi, 2.64 -0.19 dBi...

We have investigated the fundamental and high-order spoof localized surface plasmons (LSPs) modes in proposed corrugated ring resonator printed on a thin dielectric substrate with or without ground plane. An efficient ease-of-integration method to excite LSPs textured has been adopted suppress unwanted enhance modes. A multi-band-pass filter numerically demonstrated. Experimental results at microwave frequencies verify high performances of filter, showing great agreements simulation results....

Although subwavelength planar terahertz (THz) plasmonic devices can be implemented based on spoof surface plasmons (SPs), they still suffer from a little high propagation loss. Here the dispersion and characteristics of waveguide composed double metal strips corrugated with dumbbell shaped grooves have been investigated. It has found that much lower loss longer length achieved compared conventional rectangular grooves. Moreover, implement decrease in size about 22%. An ultra-wideband THz...

By directly incorporating a sub-wavelength amplifier chip into the spoof plasmonic resonator, quality (Q) factor of original passive resonator has been significantly increased by several orders magnitude. The is composed corrugated ring with slit whose optimized offset angle φ 45°, aiming to achieve better Q-factor. tuning bias voltage applied that placed across slit, Q from 9.8 21000 for quadrupole mode when plastic pipe filled polar liquids upon resonator. Experiments at microwave...

Large metallic losses and short propagation lengths associated with surface plasmons (SPs) have long been considered as the obstacles which severely limit practical applications of plasmonic waveguides. In this paper, we introduce concept dielectric spoof SPs (SSPs) show that subwavelength high-contrast gratings (HCGs) offer a route to effectively suppress hence dramatically increase length electromagnetic waves. We experimentally realized wideband ultra-low-loss high-confinement waveguide...

A convenient strategy is demonstrated for placing C60 nanoclusters in hot spots between neighbouring arms of silver nano-dendrites leading to intense surface-enhanced Raman scattering (SERS) enhancement. The finite difference time domain calculations indicate that the dendrite-like model pattern may demonstrate a high quality SERS property owing 'metal/nanoclusters/metal' geometries. Further provide useful guidelines synthesis dendritic geometries and further increasing enhancement factor SERS.

We numerically demonstrate that spoof localized surface plasmons (LSPs) resonant modes can be enhanced based on ultrathin corrugated metal-insulator-metal (MIM) ring resonator. Further enhancement of the LSPs has been achieved by incorporating an efficient and ease-of-integration exciting method. Quality factors resonance peaks have become much larger multipolar resonances easily observed textured MIM resonator excited a microstrip line. Experimental results validate high-efficiency...

Abstract Fano resonance has received much attention in recent years due to its promising applications surface enhanced phenomena, sensing, and nonlinear optics. However, it is challenging achieve both high quality ( Q ) factor intensity using the resonance. Different from active switching/tuning of plasmonic resonances, gain‐assisted spoof for first time proposed enhance significantly, which a subwavelength amplifier chip incorporated into passive structure composed two stacked corrugated...

We propose a multidirectional surface-wave splitter excited by cylindrical wire. Such could function as plasmonic wavelength-division multiplexer, since electromagnetic waves at the designed frequencies will be confined and guided along different multiple grating structures that are placed around The experimental verification of proposed has been implemented in microwave frequencies. measurement results have excellent agreements to full-wave simulations show good performance splitter. also...

We propose a broadband slow wave system based on the thin metal-insulator-metal (MIM) graded grating structure composed of two corrugated metal strips with periodic array grooves dielectric substrate. The guided spoof surface plasmon polaritons (SSPPs) at different frequencies can be localized positions along ultrathin MIM grating. By introducing specially designed non-corrugated branches specific lengths locations where EM waves are trapped, trapped released and propagate these branches. A...

We have proposed and experimentally demonstrated a band-notched surface plasmonic filter, which is composed of an ultra-wide passband filter with simple C-shaped ring on the back substrate. Enhanced narrowband or broadband rejections spoof plasmon polaritons (SPPs) can be achieved double rings in propagation transverse direction. By mounting active components across slit cut ring, dynamic control rejection SPPs accomplished. Both bandwidth controlled when Schottky barrier diode...

In this letter, a novel high-isolation 35/94-GHz dual-frequency orthogonal Cassegrain antenna is designed. The consists of D = 800 mm main reflector, subreflector, and dual-band orthogonal-polarization feed. order to get similar feed horn's E-H radiation patterns phase center positions at the dual frequencies separately, dual-mode conical horn designed in For obtaining high isolation, three-order low-pass filter Ka-band waveguide port. measured gains are 43.6 51.3 dBi, sidelobe levels -27.5...

Abstract In this work, we report the existence of spoof localized surface plasmons (spoof-LSPs) arising with closed high contrast gratings (HCGs) at deep subwavelength scales, another platform for field localization microwave frequencies. The HCGs are in form a periodic array radial dielectric blocks permittivity around metal core supporting spoof-LSPs transverse magnetic (TM) form. Simulation results validate phenomenon and metamaterial approach is also given to capture all resonant...

The printed electrodes for detecting direct current signal changes of human vital signs have been fully investigated. Here a flexible and microwave plasmonic sensor liquid solutions is proposed demonstrated. noninvasive measurement at frequencies based on the spoof localized surface plasmons resonator, which composed metal corrugated ring fabricated PET substrate using inkjet printing technology. winding-shaped polydimethylsiloxane (PDMS) microfluidic channel interleaved with to simulate...

Bidirectional surface wave splitters excited by a cylindrical wire in the microwave frequency have been proposed and fabricated. Compared to bidirectional subwavelength-slit splitter, novelty of structure is coupling mechanism from gratings. By designing grating structures with different depths feeding wire, electromagnetic waves at designed frequencies will be confined guided predetermined opposite directions. The finite integral time-domain method used model splitters. Experimental results...

We propose a broadband slow-wave system based on metallic graded grating structures of subwavelength thickness. A metal wire is used to excite the slow waves propagating along gratings. The analysis and full-wave simulations show that electromagnetic could be stopped at designed positions under different frequencies. Experiments are conducted in microwave frequencies verify proposed system. measured results very good agreements simulations. have further modeled thickness terahertz (THz)...